Figure 1 : Iron-chelating activity of the green tea extract, black tea extract, EGCG, and theaflavins determined using a siderophore colorimetric assay.

From: Tea polyphenols inhibit the growth and virulence properties of Fusobacterium nucleatum

Figure 1

A decrease in A630 occurs when a strong chelator removes the iron from the chrome azurol sulfate dye. Ferrichrome, a siderophore produced by U. sphaerogena, was used as positive control. Results are expressed as the means ± SD of triplicate assays from two independent experiments. All values are significantly different from the negative control (p < 0.01).